xref: /freebsd-9.3-release/contrib/ncurses/ncurses/fifo_defs.h

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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
 * Common macros for lib_getch.c, lib_ungetch.c
 *
 * $Id: fifo_defs.h,v 1.6 2008/06/28 15:52:32 tom Exp $
 */

#ifndef FIFO_DEFS_H
#define FIFO_DEFS_H 1

#define head	sp->_fifohead
#define tail	sp->_fifotail
/* peek points to next uninterpreted character */
#define peek	sp->_fifopeek

#define h_inc() { head == FIFO_SIZE-1 ? head = 0 : head++; if (head == tail) head = -1, tail = 0;}
#define h_dec() { head == 0 ? head = FIFO_SIZE-1 : head--; if (head == tail) tail = -1;}
#define t_inc() { tail == FIFO_SIZE-1 ? tail = 0 : tail++; if (tail == head) tail = -1;}
#define t_dec() { tail == 0 ? tail = FIFO_SIZE-1 : tail--; if (head == tail) fifo_clear(sp);}
#define p_inc() { peek == FIFO_SIZE-1 ? peek = 0 : peek++;}

#define cooked_key_in_fifo()	((head != -1) && (peek != head))
#define raw_key_in_fifo()	((head != -1) && (peek != tail))

#undef HIDE_EINTR

#endif /* FIFO_DEFS_H */